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Agilent Technologies 6681A, 6684A, 6680A, 6683A 26. A10 Control Board, Schematic Diagram Sheet 2

Models: 6682A 6680A 6681A 6683A 6684A

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Figure 6-26. A10 Control Board, Schematic Diagram (Sheet 2 of 4)

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Agilent Technologies 6681A, 6684A, 6680A, 6683A, 6682A service manual 26. A10 Control Board, Schematic Diagram Sheet 2

Contents

Agilent Part No Microfiche Part No September Certification Safety Considerations Printing History Safety Symbol DefinitionsSymbol Description Table of Contents Backdating DiagramsPrinciples Of Operation Replaceable PartsIntroduction Scope OrganizationInstrument Identification Chapter DescriptionChange Sheet Related DocumentsManual Revisions Firmware RevisionsElectrostatic Discharge Safety ConsiderationsConventions Current-Monitoring Resistor IntroductionTests Test Equipment Required List of EquipmentElectronic Load Programming Parameters Programming The Tests General ConsiderationsGeneral Measurement Techniques Performance Test Record SheetsConstant Voltage CV Tests Operation Verification TestsPerformance Tests Constant Voltage CV Test Setup Verification CV Source Effect Constant Voltage CV Tests Action Normal ResultVoltage Programming and Readback Accuracy CV Load EffectCV Noise Pard Transient Response Waveform Verification Transient Recovery TimeCC Noise Pard Constant Current CC TestsConstant Current CC Tests Action Normal Result Current Programming and Readback AccuracyCC Load Effect CC Source Effect CC Load Effect Test Setup Verification CC rms Noise Test Setup Verification Averaging the CC Measurements Test Facility Performance Test Record FormUncertainty ResultsSpec Vout 0.5mV Vout + 0.5mV 900 nV Vout 1mV Vout + 1mV Vout 1.7mV Vout + 1.7mV Vout 2.3mV Vout + 2.3mV Topic Information Given Introduction Localizing the ProblemTroubleshooting Chapter OrganizationTest Equipment Required Troubleshooting Procedures Power-On SelftestPRI Iram FP ROMEE Chksm PRI XramBias and Reference Supplies Troubleshooting ChartsTroubleshooting Test Points Chart Trouble or CircuitOverall Troubleshooting Sheet 1 Overall Troubleshooting Sheet 2 Overall Troubleshooting Sheet 3 Overall Troubleshooting Sheet 4 No Display Troubleshooting OV Will Not Fire Troubleshooting OV At Turn-On Troubleshooting Output Held Low Troubleshooting Sheet 1 Output Held Low Troubleshooting Sheet 2 Output Held High Troubleshooting DAC Circuits Troubleshooting DAC Test Waveforms Troubleshooting CV/CC DAC and Amplifier Circuit Troubleshooting 10. Serial Down Troubleshooting Sheet 1 10. Serial Down Troubleshooting Sheet 2 11. Secondary Interface Down Sheet 1 Troubleshooting 11. Secondary Interface Down Sheet 2 Troubleshooting 12. Slow Downprogramming Troubleshooting Static Troubleshooting CV/CC Status Annunciators TroubleshootingA3 FET Board Troubleshooting FET Troubleshooting Chart Procedure ResultDynamic Troubleshooting 13. A3 FET Board Test Waveforms Troubleshooting Agilent Technologies ,6681A,O,fA.01.05sA.01.04pA.0l.02 Signature Analysis IntroductionAllocate L$52 Output 705*IDN? Enter 705L$ Disp L$ 50 END Test Headers Pins DescriptionFront Panel Test Connector A1J3 Valid A2U106 ROM Firmware Revision A.01.06 Primary Interface SA Test16. Signature Analysis Connections, Sheet 1 Troubleshooting Valid A1U4 ROM Firmware Revision A.01.07 Valid A5U504 ROM Firmware Revision A.01.04 Secondary Interface SA TestRestoring Factory Calibration Constants Post-Repair Calibration When RequiredCalibration Password Inhibit Calibration JumperEeprom Initialization Initialization I or Factory Preset Replacement F?Initialization I or Factory Preset Replacement F? F Clear Screen END Select Case ElseCase ElseEND if Stop1530 END Disassembly ProceduresTools Required ReturnGpib Board Top CoverRemoving Protective RFI Shield Galvanized Sheet Metal A3 FET Board A4 AC Input AssemblyA5 DC Rail Assembly A6 Bias AssemblyA1 Front Panel Board A10 Control AssemblyFront Panel Assembly S1 Line SwitchOutput Bus Boards A7, A81 and A9 & Chassis Components A1DSP1 LCD DisplayA1G1 and A1G2 Rotary Controls A1KPD KeypadPage 19 -Inch Front Panel Frame Assembly Troubleshooting 20 -Inch Front Panel Frame Assembly Troubleshooting 21. Assembly A10, Exploded View Troubleshooting 22. Assembly A10, Exploded View 6680A, 6681A Troubleshooting Page 24. Three-Phase Line Choke Subchassis Wiring Troubleshooting 25 Volt Fan Transformer Troubleshooting Principles Of Operation A2 Gpib BoardSecondary Interface P/O A10 Board A1 Front Panel AssemblyA10 Control Board AC Calibration of Imon Principles Of Operation A5 DC Rail Board A4 AC Input BoardOutput Circuits ST Stage of the FET H-Bridge ConfigurationPage Part Description Abbreviations Assembly SeeReading the Tables Part Reference DesignatorsRef. Desig Agilent Part No Description How to Order PartsMain Chassis, Replaceable Parts BUS BAR Buss BAR Block BUSS/FET Block SENSOR-MOISTURE TERM-BLK-4 POS ConnectorTRIM-SIDES Phase Line ChokeFAN Finger Guard FAN-TUBEAXIALA1 Front Panel Board, Replaceable Parts Front Panel Board LED Assy, Replaceable Parts Mechanical Parts CORE-MAGNETIC DIO-SWITCHINGDIO-PWR Rect CORE-SHLD-BEADQ301, 302, 303 1855-0859 Replaceable Parts A4 AC Input Assembly, Replaceable Parts 10. A6 Bias Assembly, Replaceable Parts Heat SINK-TRANSISTOR 1854-0828 Assy FU-SUBMIN 4AHeat SINK-UA7805UC Regulator Assy XFMR- GpibXFMR-BIAS Heat SINK-LM317T Regulator AssyFast Sense PC Assembly Wire KIT12. A7 Fast Sense Assembly, Replaceable Parts Xstr PNP Power ModfetFU-SUBMIN 15A FU-SUBMIN 7AReplaceable Parts C588 0160-4799 CAP 2.2pF 5% C589 6680A, 6681A FET P-CHAN DIO GEN PRPPhone Receptable NETWORK-RES SIP Replaceable Parts Replaceable Parts RES 45K RES2.2M IC-VOLTAGE REG RES 10KIC-REG TL7702BCP IC OP AMPIC-LINEAR PRGMD-IC, SECIC MC74HC138N IC-CONVERTER,DIADiagrams Summary of Chapter Contents Function Description SeeD0D7 Signal Name Mnemonics Description A0--A15AD O--AD7 ANA0--ANA7Bias Board AC Input BoardDC Rail Board CC Control Sheet A3 FET BoardA10 Control Board CV Control SheetCommon General Schematic NotesGeneral Schematic Notes DP Control SheetTest Point Waveforms for Table Diagrams Circuit Board Cabling Diagram Diagrams Page A1 Front Panel Board, Schematic Diagram LED Board, Component and Test Point Location A2 Gpib Board, Component Location A2 Gpib Board, Schematic Diagram A3 FET Board, Component and Test Point Location 10. A3 FET Board, Schematic Diagram sheet 1 10. A3 FET Board, Schematic Diagram sheet 2 11. A4 AC Input Board, Component and Test Point Location 12. A4 AC Input Board, Schematic Diagram 13. A5 DC Rail Board, Component and Test Point Location 14. A5 DC Rail Board, Schematic Diagram 15. A6 Bias Board, Component and Test Point Location 16. A6 Bias Board, Schematic Diagram Sheet 1of 16. A6 Bias Board, Schematic Diagram Sheet 2 17. Power Mesh, Schematic Diagram, Models 6680A, 6681A Only Page 19. A7 Snubber Board, Component Location 21. A8 Fast Sense Board, Component Location 23. A9 Down Programming/Slow Sense, Component Location 24. A9 Down Programming/Slow Sense, Schematic Diagram 25. A10 Control Board, Component and Test Point Location 26. A10 Control Board, Schematic Diagram Sheet 1 26. A10 Control Board, Schematic Diagram Sheet 2 26. A10 Control Board, Schematic Diagram Sheet 3 26. A10 Control Board, Schematic Diagram Sheet 4 Backdating Serial Numbers Change Model 6680A Model 6683AModel 6681A Model 6684A Model 6682A-6 A2 Gpib Board -9 A5 DC Rail Board-14 Al0 Control Board -8 A4 AC Input BoardRef Desig Agilent Part No Description Table A-1. A2 Gpib Parts ListIC Drom Gpib Figure A-1. A2 Gpib Component Parts List Backdating Index IndexError code Message 104 Signal name Troubleshooting